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The spraying, which targets mosquitoes infected with the virus, will start at 8 p.m. Wednesday and last through midnight. Then the spraying will resume again Thursday at the same time.

"Our surveillance results indicate very high infection rates among mosquitoes and the need to spray in order to protect area residents from the threat of West Nile virus," said Gary Goodman, a district manager with vector control.

Aerial spraying will take place over two areas: 20,000 acres around Davis and 12,000 acres around Woodland. For the exact locations, go here.